Device for measuring activity of cobalt-60 industrial source

Abstract

The utility model discloses a device for measuring the activity of a cobalt-60 industrial source. The device comprises a radioactive source bracket and an activity measuring assembly, wherein the activity measuring assembly and the radioactive source bracket are arranged at an interval. A shielding assembly is arranged on the side, away from the radioactive source support, of the activity measuring assembly and used for absorbing rays penetrating through the detection end of the activity measuring assembly. The activity measurement assembly comprises a detection probe, a ray collimation assembly and an installation sleeve shell arranged on the ray collimation assembly in a sleeving mode. The ray collimation assembly is provided with a ray collimation channel. And the detection probe is arranged at the tail end of the ray collimation channel. The ray collimation assembly comprises a plurality of diaphragms which are arranged at intervals, and the diaphragms made of metal tungsten are adopted, so that rays in other directions can be blocked by the diaphragms made of the metal tungsten when being reflected after being in contact with the inner wall, the rays in other directions are effectively prevented from being received by a detection probe, and the detection accuracy is improved. Therefore, the detection result is prevented from being influenced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to radioactive raw material activity measurement technical field, specifically related to a kind of cobalt-60 industrial source activity measurement device. BACKGROUND

[0002] The activity measurement of radioactive source core is a very key process in the production process of radioactive source, and it is necessary to carry out this process in the raw material activity warehousing review before production, activity confirmation in production and quality inspection in later period, and even measurement after waste source recovery.

[0003] The Chinese patent with publication number "CN217443550U" discloses a kind of radioactive raw material activity automatic measurement device, including electric control module, still including vibration disc for discharging radioactive raw material, transmission guide rail being set in vibration disc export side, activity meter being set in transmission guide rail one side, and storage device being set in transmission guide rail one end;The transmission guide rail is provided with clamping jaw for clamping radioactive raw material, and the storage device is used to store the radioactive raw material after measurement classifiedly;The electric control module is electrically connected with the vibration disc, transmission guide rail, activity meter.

[0004] In the above-mentioned patent, the radioactive raw material to be measured is clamped by the clamping jaw and transported to the position of the activity meter for detection. However, the radiation released by the radioactive raw material is not single-directional radiation. During the emission process, the released radiation may be affected by external factors, for example, backscattering may occur on the inner wall of the hot cell and the collimation channel, and the backscattered radiation will irradiate the detection ionization chamber probe, which will affect the accuracy of the activity of the radioactive raw material. At the same time, the temperature and pressure of the external air will affect the detection results to some extent. UTILITY MODEL CONTENTS

[0005] In order to make up for the shortcomings of the prior art, the utility model provides a kind of cobalt-60 industrial source activity measurement device to solve the technical problem that external factors affect the activity detection results of the measured radioactive source.

[0006] To achieve the above-mentioned purpose, the specific technical scheme of the utility model is as follows:

[0007] A kind of cobalt-60 industrial source activity measurement device, including radioactive source support and activity measurement assembly being spaced apart with radioactive source support. The side of activity measurement assembly away from radioactive source support is provided with shielding assembly for absorbing the radiation penetrating the detection end of activity measurement assembly.

[0008] The activity measurement assembly includes detection probe, radiation collimation assembly and mounting sleeve shell sleeved on the radiation collimation assembly. The radiation collimation assembly is provided with radiation collimation channel. The detection probe is arranged at the end of the radiation collimation channel.

[0009] Furthermore, the aforementioned X-ray collimation assembly includes multiple apertures arranged at intervals in sequence. Each aperture has a collimation channel. The diameter of the collimation channel on each aperture decreases sequentially, forming a narrowing X-ray collimation channel. This allows the ionization chamber probe to fully absorb the radiation from the radiation source while minimizing the impact of backscattering of the radiation emitted by the radiation source in the hot chamber space and within the collimation channel on the measurement results.

[0010] Furthermore, the aperture is made of tungsten metal.

[0011] Furthermore, the mounting housing is sequentially divided into an aperture housing, a connecting housing, and an ionization chamber probe housing. Multiple apertures are disposed within the aperture housing. The inner cavity of the ionization chamber probe housing forms a measurement space for detecting the activity of the radioactive source. The detection probe is disposed within the measurement space.

[0012] Furthermore, a temperature and pressure probe is installed at the bottom of the measurement space.

[0013] Furthermore, a sealing plate is fixed to the end of the ionization chamber probe housing that is away from the aperture housing. The sealing plate is made of a lightweight material.

[0014] Furthermore, the shielding assembly includes a shielding door and a shielding housing. The shielding housing is integrally formed with the ionization chamber probe housing. The shielding door is located at the outer end of the shielding housing.

[0015] Furthermore, the inner wall of the shielding shell adopts an inclined stepped zigzag structure. Shielding components adapted to the shape of the inner cavity of the shielding shell are installed on the inner wall of the shielding door.

[0016] Furthermore, the shielding door and shielding components are made of lead.

[0017] Furthermore, the radiation source support includes a base plate and a support frame disposed on the top surface of the base plate. The support frame is divided into a top positioning bracket and a bottom adjustment bracket. Both ends of the positioning bracket are provided with V-shaped grooves.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. This utility model incorporates multiple apertures arranged at intervals within the mounting housing. These apertures form a collimating channel with gradually decreasing aperture size, thereby collimating the radiation emitted by the radiation source directly facing the detection probe. Simultaneously, by employing tungsten-metal apertures, radiation from other directions is reflected and scattered upon contact with the inner wall, effectively blocking these reflections and scatterings from the detection probe and preventing interference with the detection results.

[0020] 2、 The utility model discloses the outer circle of detection probe is provided with ionization chamber probe shell and sealing plate, forms the measurement space of the port of being opposite to the measured radioactive source. Meanwhile, install the temperature and pressure probe at the bottom of the measurement space, further correct the result of the collection of detection probe, make the activity measurement of the measured radioactive source more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the whole structure schematic diagram of the utility model;

[0022] Figure 2 It is the structure schematic diagram of radioactive source support in the utility model;

[0023] Figure 3 It is the structure schematic diagram of activity measurement subassembly in the utility model;

[0024] Figure 4 It is the relative position schematic diagram of radioactive source support and detection probe in the utility model.

[0025] Reference Signs: 1, radioactive source support;1-1, bottom plate;1-2, positioning support;1-3, adjusting support;2, activity measurement subassembly;2-1-1, diaphragm shell;2-1-2, connecting shell;2-1-3, ionization chamber probe shell;2-1-4, measurement space;2-1, install cover shell;2-2, diaphragm;2-3, detection probe;2-4, sealing plate;3, shielding assembly;3-1, shielding shell;3-2, shielding door;4, temperature and pressure probe. DETAILED DESCRIPTION

[0026] In the description of the utility model, it is understood that the orientation or positional relationship of the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "central", "end", "length", "outer end" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it can not be understood as the limitation of the utility model.

[0027] The utility model will be further described below in combination with the drawings.

[0028] As Figure 1 And 4As shown in the figure, a device for measuring the activity of a cobalt-60 industrial source includes a radioactive source support 1 and an activity measurement assembly 2. The radioactive source to be measured is cobalt-60, which is placed on the radioactive source support 1 during detection. The radioactive source is positioned and secured by the radioactive source support 1. The detection end of the activity measurement assembly 2 is spaced apart from the radioactive source support 1 and is on the same horizontal plane. The activity measurement assembly 2 is used to detect the activity of the radioactive source on the radioactive source support 1. The end of the activity measurement assembly 2 is provided with a shield to avoid the influence of the radiation emitted by the radioactive source on the workers performing the detection work after penetrating the detection end of the activity measurement assembly 2.

[0029] As shown in the figure, Figure 2 The radioactive source support 1 includes a bottom plate 1-1 and a support frame provided on the top surface of the bottom plate 1-1. The support frame is divided into a top positioning support 1-2 and a bottom adjusting support 1-3. The two ends of the positioning support 1-2 are provided with V-shaped grooves for limiting the two ends of the radioactive source to be measured. The adjusting support 1-3 can be rotated and finely adjusted along its axial direction, so that the radioactive source cobalt can be perpendicular to the central axis of the activity measurement assembly 2.

[0030] The radioactive source support 1 is a replaceable structure, and the corresponding positioning support 1-2 can be replaced according to the different shapes and sizes of the radioactive source to be detected, so that the position of the radioactive source with different shapes and sizes can be determined by the support, and the accurate activity value can be measured. Further, as shown in the figure, Figure 4 The radioactive source support 1 can move along the central axis direction of the activity measurement assembly 2, thereby adapting to the activity value measurement of radioactive sources with different shapes and sizes.

[0031] In this embodiment, the entire radioactive source support 1 is made of aluminum as the structural material. The bottom plate 1-1 of the radioactive source support 1 is made of stainless steel. The bottom of the adjusting support 1-3 is provided with a plurality of adjusting grooves uniformly distributed along the axial direction. A plurality of bolts pass through the adjusting grooves respectively and are connected with the bottom plate 1-1. When the adjusting support 1-3 needs to be adjusted, the bolts are loosened, so that the adjusting support 1-3 can rotate along its axial direction and translate along the long side of the bottom plate 1-1. After the adjustment is completed, the bolts are tightened, and the position of the adjusting support 1-3 is locked. The axial direction of the radioactive source to be measured is on the same plane as the detection end in the activity measurement assembly 2 and is perpendicular to the central axis of the activity measurement assembly 2, and the detection distance is 2m.

[0032] As shown in the figure, Figure 3 The activity measurement assembly 2 includes a mounting sleeve 2-1, a radiation collimation assembly, and a detection probe 2-3. In the direction away from the radioactive source to be measured, the mounting sleeve 2-1 is sequentially divided into an aperture diaphragm housing 2-1-1, a connecting housing 2-1-2, and an ionization chamber probe housing 2-1-3. The two ports of the aperture diaphragm housing 2-1-1 are respectively a radiation entrance port for the radiation of the radioactive source to be measured to enter and a radiation exit port for the radiation to exit.

[0033] The ray collimation assembly comprises a plurality of diaphragms 2-2. The diaphragms 2-2 are arranged in sequence in the diaphragm housing 2-1-1, and each diaphragm 2-2 is provided with a collimation hole. In the direction from the entrance to the exit of the diaphragm housing 2-1-1, the diameters of the collimation holes of the diaphragms 2-2 gradually decrease, forming a converging ray collimation channel. The rays emitted by the radioactive source are gradually collimated in the ray collimation channel and enter the ionization chamber probe housing 2-1-3. The inner cavity of the ionization chamber probe housing 2-1-3 is a measurement space 2-1-4 for detecting the activity of the radioactive source. The detection probe 2-3 is arranged in the measurement space 2-1-4 for collecting relevant data of the collimated rays emitted by the radioactive source, and further calculating the activity of the radioactive source.

[0034] In this embodiment, the horizontal plane in which the axis of the radioactive source is located is set as the basic detection plane. As shown in FIG. 2, one end of the extension line of the two intersection lines of the inner wall of the ray collimation channel intersects the detection probe, and the other end intersects the two ends of the radioactive source. The straight rays emitted by the radioactive source on the side of the detection probe 2-3 can all enter the ionization chamber probe housing 2-1-3 along the guide of the ray collimation channel and be collected by the detection probe. Non-straight rays such as reflected rays that contact the inner wall of the diaphragm housing 2-1-1 are avoided from entering the ionization chamber probe housing 2-1-3, which can interfere with the measurement results. Figure 4

[0035] In this embodiment, the diaphragm 2-2 is made of tungsten. A stainless steel spacer ring is arranged between each diaphragm 2-2. The spacer ring can limit the position of each diaphragm 2-2. By using a tungsten diaphragm 2-2, non-straight rays entering from the entrance are absorbed and blocked by the space between the inner wall of the diaphragm housing 2-1-1 and the tungsten diaphragm 2-2, thereby effectively reducing the entry of non-straight rays into the ionization chamber probe housing 2-1-3.

[0036] ​In the embodiment, the detection probe 2-3 is mounted in the ionization chamber probe shell 2-1-3 through a support structure, and can be adjusted in axial forward and backward and rotation to ensure that the detection probe 2-3 is in the same horizontal plane as the measured radioactive source and can be directed to the measured radioactive source. In addition, in order to ensure the sealing of the measurement space 2-1-4, a sealing plate 2-4 is mounted at the outer end of the ionization chamber probe shell 2-1-3. The sealing plate 2-4 is made of light material. By arranging the sealing plate 2-4 made of light material on the ionization chamber probe shell 2-1-3, the external air entering from the end of the ionization chamber probe shell 2-1-3 away from the measured radioactive source is reduced, thereby completing the sealing of the outer end of the ionization chamber probe shell 2-1-3 without affecting the detection of the detection probe 2-3, and further reducing the influence of external air on the detection result.

[0037] In addition, in the embodiment, a temperature and pressure probe 4 is mounted at the bottom of the measurement space 2-1-4. By collecting the air temperature and pressure in the measurement space 2-1-4, the collected results of the detection probe are further corrected, so that the activity measurement of the measured radioactive source is more accurate.

[0038] As shown in Figure 3 and 4 , the shielding assembly 3 includes a shielding door 3-2 and a shielding shell 3-1. The shielding shell 3-1 is integrally formed with the ionization chamber probe shell 2-1-3. The shielding door 3-2 is arranged at the outer end of the shielding shell 3-1. When the shielding door 3-2 is in the closed state, the shielding door 3-2, the shielding shell 3-1, and the sealing plate 2-4 of the ionization chamber probe shell 2-1-3 constitute a shielding cavity. When in use, a shielding member adapted to the shape of the shielding cavity is fixed on the inner side wall of the shielding door 3-2. The shielding door 3-2 and the shielding member are made of metal lead material. By arranging the shielding assembly 3 on the side of the detection probe 2-3 away from the measured radioactive source, the collimated rays in the measured radioactive source can be absorbed by the shielding assembly 3 when they are irradiated on the detection probe 2-3 and penetrate, thereby avoiding harm to the workers.

[0039] Further, as shown in Figure 3 and 4 , the inner wall of the shielding shell 3-1 adopts an inclined stepped fold line structure. By adapting the structure of the inner wall of the shielding shell 3-1 to the emission direction of the rays of the measured radioactive source, the inclined rays emitted by the measured radioactive source can be absorbed, thereby minimizing the influence of the radiation emitted by the measured radioactive source on the outside.

[0040] The standard source is detected to analyze the accuracy of the activity measurement system. The actual measurement data of two standard sources are shown in Table 1. The actual measurement data of the two standard sources show that the activity measurement device has high accuracy and good stability.

[0041]

[0042] The activity measurement of the cobalt-60 industrial irradiation source product with length φ11.1*451.4mm is 9969Ci, and after 11 days, according to the activity decay formula, the radioactivity should be 9930Ci, and the measured activity is 9903Ci, 9892Ci and 9894Ci, and the average value is 9896Ci, and the relative error is 0.3%. Through the measurement data of the cobalt-60 industrial irradiation source product, it is shown that the activity measurement device has the characteristics of high precision.

[0043] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An apparatus for measuring the activity of a cobalt-60 industrial source, comprising a radioactive source support (1) and an activity measuring component (2) spaced apart from the radioactive source support (1); characterized in that: The activity measuring component (2) is provided with a shielding component (3) on the side away from the radiation source support (1) to absorb the radiation that penetrates the detection end of the activity measuring component (2); The activity measurement component (2) includes a detection probe (2-3), a ray collimation component, and a mounting housing (2-1) that is fitted onto the ray collimation component; the ray collimation component has a ray collimation channel; the detection probe (2-3) is located at the end of the ray collimation channel.

2. The apparatus for measuring the activity of cobalt-60 industrial sources according to claim 1, characterized in that: The aforementioned X-ray collimation assembly includes multiple apertures (2-2) arranged sequentially at intervals; each aperture (2-2) has a collimation channel; the diameter of the collimation channel on each aperture (2-2) decreases sequentially, forming a X-ray collimation channel with a converging structure.

3. The apparatus for measuring the activity of cobalt-60 industrial sources according to claim 2, characterized in that: The aperture (2-2) is made of tungsten metal.

4. The apparatus for measuring the activity of cobalt-60 industrial sources according to claim 2, characterized in that: The mounting housing (2-1) is sequentially divided into an aperture housing (2-1-1), a connecting housing (2-1-2), and an ionization chamber probe housing (2-1-3); multiple apertures (2-2) are arranged inside the aperture housing (2-1-1); the inner cavity of the ionization chamber probe housing (2-1-3) forms a measurement space (2-1-4) for detecting the activity of the radioactive source; the detection probe (2-3) is arranged inside the measurement space (2-1-4).

5. The apparatus for measuring the activity of cobalt-60 industrial sources according to claim 4, characterized in that: A temperature and pressure probe (4) is installed at the bottom of the measurement space (2-1-4).

6. The apparatus for measuring the activity of cobalt-60 industrial sources according to claim 4, characterized in that: The ionization chamber probe housing (2-1-3) is fixed with a sealing plate (2-4) at one end away from the aperture housing (2-1-1); the sealing plate (2-4) is made of lightweight material.

7. The apparatus for measuring the activity of cobalt-60 industrial sources according to claim 1, characterized in that: The shielding assembly (3) includes a shielding door (3-2) and a shielding housing (3-1); the shielding housing (3-1) is integrally formed with the ionization chamber probe housing (2-1-3); the shielding door (3-2) is located at the outer end of the shielding housing (3-1).

8. The apparatus for measuring the activity of cobalt-60 industrial sources according to claim 7, characterized in that: The inner wall of the shielding shell (3-1) adopts an inclined stepped zigzag structure; the inner side wall of the shielding door (3-2) is equipped with shielding components that are adapted to the shape of the inner cavity of the shielding shell (3-1).

9. The apparatus for measuring the activity of cobalt-60 industrial sources according to claim 8, characterized in that: The shielding door (3-2) and shielding components are made of lead.

10. The apparatus for measuring the activity of industrial cobalt-60 sources according to claim 1, characterized in that: The radiation source support (1) includes a base plate (1-1) and a support frame set on the top surface of the base plate (1-1); the support frame is divided into a top positioning support (1-2) and a bottom adjustment support (1-3); both ends of the positioning support (1-2) are provided with V-shaped grooves.

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